Same as
Smaller than
Bigger than
None of these
C. Bigger than
Cetane number 65
Octane number 65
Cetane number 35
Octane number 35
Carburettor
Injector
Governor
None of these
30 to 40 %
40 to 60 %
60 to 70 %
75 to 90 %
Opens at 50° before bottom dead centre and closes at 15° after top dead centre
Opens at bottom dead centre and closes at top dead centre
Opens at 50° after bottom dead centre and closes at 15° before top dead centre
May open and close anywhere
To distribute spark
To distribute power
To distribute current
To time the spark
8 : 1
10 : 1
15 : 1
20 : 1 and less
Increase
Decrease
Remain same
None of these
Enhance flow rate
Control air flow
Induce primary swirl
Induce secondary turbulence
Maximum pressure developed
Minimum pressure
Instantaneous pressure at any instant
Average pressure
White
Bluish
Black
Violet
Jet area is automatically varied depending on the suction
The flow from the main jet is diverted to the compensating jet with increase in speed
The diameter of the jet is constant and the discharge coefficient is invariant
Flow is produced due to the static head in the float chamber
Piston ring and cylinder wear
Formation of hard coating on piston skirts
Oil sludge in the engine crank case
Detonation
Unaffected
Lower
Higher
Dependent on other factors
Half
Same
Double
Four times
Pre-ignition period
Delay period
Period of ignition
Burning period
Highly ignitable
More difficult to ignite
Less difficult to ignite
None of these
6 to 10
10 to 15
15 to 25
25 to 40
10 bar
20 bar
25 bar
35 bar
Scavenging
Turbulence
Supercharging
Pre-ignition
Compression ratio for petrol engines varies from 6 to 10
Higher compression ratio in diesel engines results in higher pressures
Petrol engines work on Otto cycle
All of the above
Low heat value of oil
High heat value of oil
Net calorific value of oil
Calorific value of fuel
Equally efficient
Less efficient
More efficient
None of these
500-1000°C
1000-1500°C
1500-2000°C
2000-2500°C
Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals
It catches fire without external aid
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off
Same
Less
More
None of these
0.2 kg
0.25 kg
0.3 kg
0.35 kg
High heat value
Low heat value
Net calorific value
Calorific value
Decrease
Increase
Remain same
None of these
Cetane number
Octane number
Calorific value
None of these
Mechanical efficiency
Overall efficiency
Volumetric efficiency
Relative efficiency